EP0093651B1 - Récepteur de signaux multiporteuses protégé des signaux perturbateurs - Google Patents

Récepteur de signaux multiporteuses protégé des signaux perturbateurs Download PDF

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Publication number
EP0093651B1
EP0093651B1 EP83400824A EP83400824A EP0093651B1 EP 0093651 B1 EP0093651 B1 EP 0093651B1 EP 83400824 A EP83400824 A EP 83400824A EP 83400824 A EP83400824 A EP 83400824A EP 0093651 B1 EP0093651 B1 EP 0093651B1
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EP
European Patent Office
Prior art keywords
circuit
signal
detected
receiver
carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83400824A
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German (de)
English (en)
French (fr)
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EP0093651A1 (fr
Inventor
Michel Carpe
Claude Collin
Marc Pontif
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Thales SA
Original Assignee
Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0093651A1 publication Critical patent/EP0093651A1/fr
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Publication of EP0093651B1 publication Critical patent/EP0093651B1/fr
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only

Definitions

  • the invention relates to multicarrier type transmission equipment, and more particularly to a receiver adapted to this type of transmission protected from disturbing signals.
  • the receiver For reception of signals composed of several modulated carriers, it is not profitable to use a reception channel per carrier frequency.
  • the receiver therefore generally comprises high frequency and intermediate frequency circuits common to all the modulated carriers, and for each carrier a particular circuit allowing demodulation.
  • Such a receiver is for example described in US-A-3,042,800.
  • the intermediate frequency amplifier common to all the carriers is an amplifier with automatic gain control, the gain of which is controlled by a voltage proportional to the envelope of the received signal having the highest level among the signals transmitted on the different carriers .
  • This arrangement makes it possible to obtain, under normal conditions, a linear operation of the gain control amplifier.
  • the subject of the present invention is a signal receiver protected from disturbances, the difference between the disturbing signal and the useful signal of the highest level being able to reach 80 decibels, the frequency of the disturbing being close to or even equal to one of the frequencies received.
  • a multicarrier signal receiver comprising high frequency and intermediate frequency amplification circuits common to the set of n modulated carriers and a demodulation circuit comprising for each modulated carrier a filter, a detector amplifier having detected signal outputs, and a demodulator having demodulated signal outputs
  • the receiver further comprises a disturbance detection circuit coupled to the outputs of the demodulation circuit and providing control signals characteristic of the appearance or disappearance of a disturbing signal on each of the channels, and a circuit for preselection and selective attenuation of carriers at intermediate frequency inserted between the high frequency circuit and the intermediate frequency circuit , the preselection and attenuation circuit comprising acco filters rdés on the carriers in intermediate frequency followed by attenuators controlled by the control signals, as well as an adder.
  • FIG. 1 represents the classic diagram of a multicarrier receiver.
  • Figure 2 is a schematic diagram of the frequency spectrum.
  • FIG. 3 is the diagram of the multicarrier receiver protected from disturbances according to the invention.
  • the conventional multicarrier receiver shown in FIG. 1 comprises high frequency circuits 1, intermediate frequency circuits 2, amplification, detection and demodulation circuits 3.
  • the high frequency circuits 1 include a bandpass filter 11 coupled to the input E of the receiver, the output of which is connected to the input of an amplifier 12 having its output connected to the first input of a mixer 13.
  • the second input of the mixer is connected to the output of a local oscillator 14.
  • the output of the oven mixer nit the intermediate frequency signal applied to the input of the intermediate frequency circuits 2 which include a bandpass filter 20 followed by an intermediate frequency amplifier 21.
  • This amplifier is an amplifier with automatic gain control having an AGC input.
  • the output of this amplifier 21 constitutes the output of the intermediate frequency circuits and is connected to the input of the demodulation circuits 3.
  • These demodulation circuits comprise, for each carrier, a bandpass filter 30 tuned to the frequency of the corresponding channel , f 1 , f 2 ...
  • the intermediate frequency amplifier with automatic gain control was controlled by the maximum detected voltage of the different carriers.
  • the outputs of the detector amplifiers 31, supplying the detected voltages V d l, V d2 ... V dn are connected to the inputs of an automatic gain control circuit 4. This circuit selects from the voltages applied to its different inputs, those with the highest level, and transmits it, with suitable gain, to the automatic gain control input of the intermediate frequency amplifier 21.
  • FIG. 2 represents the levels detected in the different carrier frequency channels f 1 , f 2 , ... f i ... f n.
  • V dm i n and V dmax be the minimum and maximum detected voltages on the different channels.
  • D o is the difference between the two detected extreme voltages, and is generally of the order of 10 dB.
  • a level disturbing signal Vp has been shown in dotted lines at a frequency close to the frequency f ; of track i.
  • D be the useful dynamics of the limiters allowing proper operation of the demodulators.
  • D is of the order of 30 decibels, the difference DD o equal to 20 decibels fixes the maximum admissible level of the disturbing signal at 20 decibels above the highest useful signal. If the level is exceeded, the signal at the input of the demodulators becomes lower than their operating threshold; all channels are affected by this disruptor.
  • FIG. 3 represents the receiver according to the invention. Like the conventional receiver, it includes high frequency circuits 1 whose input is coupled to the input E of the receiver and whose output is coupled to the input of the intermediate frequency circuits 2. However, between the high frequency circuits and the intermediate frequency circuits, the receiver according to the invention comprises a circuit for preselection and selective frequency attenuation, 5, constituted in the following manner.
  • the output of the high frequency circuits 1 is connected to the inputs of n bandpass filters, centered respectively on the carrier frequencies of the different channels.
  • Each bandpass filter 51 is followed by an electronically controlled attenuator 52 whose maximum attenuation can exceed 80 decibels, the residual attenuation being a few decibels.
  • the outputs of these attenuators are connected to the inputs of an adder 53.
  • the bandpass filters of this preselection circuit centered on the frequencies f i , have a bandwidth sufficient to transmit the modulated signal, and have attenuation allowing d 'eliminate the frequencies close to frequencies f ; .
  • the output of the adder 53 is connected to the input of the intermediate frequency circuits 2.
  • the output of these circuits is connected, as in the conventional receiver, to the input of a detection and demodulation circuit 3, to n separate tracks.
  • This circuit 3 supplies, as before, the demodulated output signals Si ... S n , and the detected voltages V dl ... V dn .
  • the demodulated useful signal S i of the channel i contains characteristic information H i making it possible to identify it as a signal actually transmitted. This information can be a pilot frequency when the circuit transmits analog signals, or the clock frequency recovered for a transmission of digital signals.
  • the detected signal outputs V di are connected to the inputs of the automatic gain control circuit, AGC, 4 by means of electronically controlled switches 8.
  • the control input of the switch corresponding to the channel of index i is connected to the output Ci of the corresponding control circuit.
  • the corresponding switch is open, so that the detected voltage V di does not contribute to the development of the gain control voltage of the control amplifier automatic gain.
  • the output of the AGC circuit 4 delivers to the automatic gain control input the voltage V dmâX equal to the highest detected voltage of all the channels except that of the channel i in which a disturbing signal has been detected.
  • the circuit 6 On the arrival of a disturbing signal, the circuit 6 therefore detects the channel i disturbed by disappearance of the pilot or clock frequency while the detected signal has a high level, and eliminates via the switches 7 and 8 the contribution of channel i in the demodulated signal on the one hand and for the development of the automatic gain control voltage of the intermediate frequency circuit on the other hand.
  • the disturbing signal remains at a high level at the input of the intermediate frequency amplifier. It is therefore necessary to attenuate it to avoid the formation of intermodulation products in this intermediate amplifier common to the n carriers. Indeed, a high level disturbing signal at the input of the intermediate frequency amplifier saturates the amplifier which then works in a non-linear area and generates intermodulation products.
  • the intermodulation products generated by the non-linearity of the intermediate frequency amplifier are products of type 2 fk-fi, k and i being the indices of the two neighboring carriers. These products can be located around a frequency f j close to the first two.
  • a first solution consists in cutting the channel of index i at the input of the intermediate frequency amplifier by controlling a very high attenuation A of the corresponding attenuator 52 of channel i.
  • a second solution corresponding to the preferred embodiment of the invention shown in FIG. 3, consists in introducing an attenuation before amplification at intermediate frequency, on the channel of index i in which a disturbing signal has been detected, this attenuation being variable with the disturbance level on the one hand, and the detected levels of the other channels on the other hand.
  • This solution makes it possible to reduce the disturbing signal at the input of the intermediate frequency amplifier to a level such that non-linearities are avoided, thus eliminating any risk of intermodulation, but by keeping this disturbing signal at a level included in the dynamics of the demodulator, for example at the highest level of the n-1 other useful carrier frequencies.
  • the receiver comprises a comparison circuit 9 comprising n comparators such as 91, receiving on the one hand the detected voltage V di of the corresponding channel, and on the other hand the maximum detected voltage V dmax of voltages detected in undisturbed channels.
  • This voltage V dmax is none other than the output voltage of the automatic gain control circuit 4.
  • the comparator 91 then delivers a signal proportional to V dmax -V di transmitted or not to the corresponding attenuator 52 of the channel i according to that the corresponding switch of the interrupt circuit 10 is open or closed; this control of the switches 10 is carried out by the control signals C ; .
  • the level in the disturbed channel is equal to the maximum level detected in the other channels, and the disturbing signal detection circuit continuously supplies the presence information.
  • the signal detected in this channel having a relatively high level while the clock level of the signal recovered in this same channel is very low.
  • the disturbing signal disappears, the clock level becomes again high compared to the level of the signal detected in this same channel and the control signal changes state; the corresponding switches 7 and 8 close while the switch 10 controlling the attenuation opens.
  • a multicarrier receiver of the type described above continues to operate under good conditions with disturbing signals, the improvement provided being of the order of 60 decibels compared to the conventional system described above.
  • the invention applies to multicarrier type transmission equipment and in particular to satellite radiocommunications, tropospheric or ionospheric radiocommunications in frequency diversity, or radiocommunications from mobile vehicles, in frequency diversity.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Superheterodyne Receivers (AREA)
  • Radio Transmission System (AREA)
EP83400824A 1982-05-04 1983-04-26 Récepteur de signaux multiporteuses protégé des signaux perturbateurs Expired EP0093651B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8207754 1982-05-04
FR8207754A FR2526609A1 (fr) 1982-05-04 1982-05-04 Recepteur de signaux multiporteuses protege des signaux perturbateurs

Publications (2)

Publication Number Publication Date
EP0093651A1 EP0093651A1 (fr) 1983-11-09
EP0093651B1 true EP0093651B1 (fr) 1986-05-07

Family

ID=9273719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400824A Expired EP0093651B1 (fr) 1982-05-04 1983-04-26 Récepteur de signaux multiporteuses protégé des signaux perturbateurs

Country Status (6)

Country Link
US (1) US4509206A (enrdf_load_stackoverflow)
EP (1) EP0093651B1 (enrdf_load_stackoverflow)
JP (1) JPS58204635A (enrdf_load_stackoverflow)
CA (1) CA1215127A (enrdf_load_stackoverflow)
DE (1) DE3363368D1 (enrdf_load_stackoverflow)
FR (1) FR2526609A1 (enrdf_load_stackoverflow)

Families Citing this family (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665560A (en) * 1985-05-20 1987-05-12 Texas Instruments Incorporated Wide band automatic gain control with limiting amplifiers
JPH0338906A (ja) * 1989-07-05 1991-02-20 Pioneer Electron Corp 受信装置
US5384547A (en) * 1993-08-02 1995-01-24 Motorola, Inc. Apparatus and method for attenuating a multicarrier input signal of a linear device
SE503548C2 (sv) * 1993-10-01 1996-07-01 Telia Ab Anordning i OFDM fleranvändarsystem
US5625871A (en) * 1994-09-30 1997-04-29 Lucent Technologies Inc. Cellular communications system with multicarrier signal processing
US5570350A (en) * 1994-09-30 1996-10-29 Lucent Technologies Inc. CDMA cellular communications with multicarrier signal processing
US5745846A (en) * 1995-08-07 1998-04-28 Lucent Technologies, Inc. Channelized apparatus for equalizing carrier powers of multicarrier signal
US6075991A (en) * 1996-03-08 2000-06-13 Watkins-Johnson Company Wireless base station with near-far gain compensation
US6078796A (en) * 1998-01-29 2000-06-20 Motorola, Inc. Method and apparatus for receiving a wideband signal using multiple automatic gain controllers
US6704317B1 (en) 1998-05-27 2004-03-09 3Com Corporation Multi-carrier LAN modem server
US6507585B1 (en) 1998-05-27 2003-01-14 3Com Corporation Multi-carrier LAN adapter device using frequency domain equalizer
US6891887B1 (en) 1998-05-27 2005-05-10 3Com Corporation Multi-carrier LAN adapter device using interpolative equalizer
US6603811B1 (en) 1998-05-29 2003-08-05 3Com Corporation Low complexity frequency domain equalizer having fast re-lock
US6377683B1 (en) 1998-05-29 2002-04-23 3Com Corporation Low complexity frequency domain echo canceller for DMT transceivers
US6477182B2 (en) * 1999-06-08 2002-11-05 Diva Systems Corporation Data transmission method and apparatus
DE60037722T2 (de) * 2000-05-17 2009-01-15 Sony Deutschland Gmbh AM Empfänger
EP2755344B1 (en) 2000-08-24 2018-07-25 Sony Deutschland Gmbh Communication device for transmitting OFDM signals in a wireless communication system
JP2002176239A (ja) * 2000-12-06 2002-06-21 Agilent Technologies Japan Ltd 高周波回路基板の接続装置及び接続方法
JP2005531202A (ja) 2002-06-21 2005-10-13 ワイデファイ インコーポレイテッド 無線ローカル・エリア・ネットワーク・リピータ
JP3924300B2 (ja) * 2002-07-04 2007-06-06 富士通株式会社 無線受信機
US20050124308A1 (en) * 2002-07-04 2005-06-09 Yasuhiro Shibuya Radio receiver
US8885688B2 (en) * 2002-10-01 2014-11-11 Qualcomm Incorporated Control message management in physical layer repeater
WO2004038958A1 (en) * 2002-10-24 2004-05-06 Widefi, Inc. Wireless local area network repeater with in-band control channel
AU2003274992A1 (en) * 2002-10-11 2004-05-04 Widefi, Inc. Reducing loop effects in a wireless local area network repeater
CN100574147C (zh) * 2002-10-15 2009-12-23 高通股份有限公司 用于扩展网络覆盖范围的具有自动增益控制的无线局域网转发器
US8078100B2 (en) 2002-10-15 2011-12-13 Qualcomm Incorporated Physical layer repeater with discrete time filter for all-digital detection and delay generation
WO2004047308A2 (en) * 2002-11-15 2004-06-03 Widefi, Inc. Wireless local area network repeater with detection
US7230935B2 (en) * 2002-10-24 2007-06-12 Widefi, Inc. Physical layer repeater with selective use of higher layer functions based on network operating conditions
AU2003300938A1 (en) * 2002-12-16 2004-07-29 Widefi, Inc. Improved wireless network repeater
WO2004068754A1 (ja) * 2003-01-30 2004-08-12 Fujitsu Limited マルチキャリア受信装置
US8027642B2 (en) 2004-04-06 2011-09-27 Qualcomm Incorporated Transmission canceller for wireless local area network
CN1993904B (zh) * 2004-05-13 2011-09-07 高通股份有限公司 具有用于上行链路及下行链路同步之下行链路检测的非变频中继器
CN1985528B (zh) * 2004-06-03 2010-06-09 高通股份有限公司 具有低成本高性能本振架构的变频中继器
WO2006081405A2 (en) * 2005-01-28 2006-08-03 Widefi, Inc. Physical layer repeater configuration for increasing mino performance
KR101068057B1 (ko) * 2006-03-31 2011-09-28 퀄컴 인코포레이티드 와이맥스 시스템들에서의 동작을 위한 향상된 물리적 계층 중계기
JP4843088B2 (ja) * 2006-09-01 2011-12-21 クゥアルコム・インコーポレイテッド アイソレーション向上のための適応が行われたデュアル受信機アンテナ構成またはデュアル送信機アンテナ構成を有するリピータ
EP2064903A4 (en) * 2006-09-21 2011-12-14 Qualcomm Inc METHOD AND APPARATUS FOR REDUCING OSCILLATION BETWEEN REPEATERS
US8774079B2 (en) 2006-10-26 2014-07-08 Qualcomm Incorporated Repeater techniques for multiple input multiple output utilizing beam formers
FR2927202A1 (fr) * 2008-02-04 2009-08-07 France Telecom Ponderation en puissance d'un signal multiporteuse a la reception dans un systeme de communication.
US20100074371A1 (en) * 2008-09-24 2010-03-25 Donald Lee West Ultra narrow band frequency selectior for zero point modulated carrier
IL266247B (en) * 2019-04-18 2020-10-29 Elbit Systems Land & C4I Ltd A high frequency radio that includes an adjustable bandpass filter to improve incoming call detection and incoming call processing methods

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042800A (en) * 1960-07-01 1962-07-03 Hughes Aircraft Co Selective automatic gain control circuit
US3411088A (en) * 1965-02-09 1968-11-12 Bell Telephone Labor Inc Automatic input power level adjustment apparatus for amplifier of a broadband repeater
US3667043A (en) * 1969-09-19 1972-05-30 Telcom Inc Constant gain bandwidth product communication satellite repeater
US3831095A (en) * 1973-03-26 1974-08-20 G Mounce Receiver system having multiple contributing channels
US4126828A (en) * 1976-07-31 1978-11-21 Trio Kabushiki Kaisha Intermodulation antiinterference device for superheterodyne receiver

Also Published As

Publication number Publication date
JPS58204635A (ja) 1983-11-29
CA1215127A (en) 1986-12-09
DE3363368D1 (en) 1986-06-12
FR2526609B1 (enrdf_load_stackoverflow) 1984-09-14
EP0093651A1 (fr) 1983-11-09
JPH0378812B2 (enrdf_load_stackoverflow) 1991-12-16
FR2526609A1 (fr) 1983-11-10
US4509206A (en) 1985-04-02

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